27 lines
1.1 KiB
Text
27 lines
1.1 KiB
Text
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#!/bin/sh
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# The way back to the boot image dracut made (ADR 0039, D20), as
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# /etc/grub.d/41_dracut_fallback (root, 0755) on the instance's host at home, which
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# update-grub runs. Ubuntu 26.04 builds its boot images with dracut, and
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# dropbear-initramfs needs initramfs-tools, which replaces it: should an image of
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# initramfs-tools not open the root disk, this entry boots a kernel with the image
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# dracut had made for it, kept beside it as initrd.img-<version>.dracut. Chosen at the
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# iMac in GRUB's menu (grub-halkyon.cfg). Once initramfs-tools' images have booted,
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# the copy and this file may go.
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set -e
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boot=$(findmnt -no UUID /boot)
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for image in /boot/initrd.img-*.dracut; do
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[ -e "$image" ] || continue
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version=${image#/boot/initrd.img-}
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version=${version%.dracut}
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[ -e "/boot/vmlinuz-$version" ] || continue
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echo "Found the way back: $version with dracut's image" >&2
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cat <<EOF
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menuentry 'Ubuntu, $version with dracut (the way back)' {
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insmod part_gpt
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insmod ext2
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search --no-floppy --fs-uuid --set=root $boot
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linux /vmlinuz-$version root=/dev/mapper/ubuntu--vg-ubuntu--lv ro
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initrd /initrd.img-$version.dracut
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}
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EOF
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done
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